<template>
  <form-item-wrapper :designer="designer" :field="field"
                     :rules="rules" :design-state="designState"
                     :parent-widget="parentWidget"
                     :parent-list="parentList"
                     :index-of-parent-list="indexOfParentList"
                     :sub-form-row-index="subFormRowIndex"
                     :sub-form-col-index="subFormColIndex"
                     :sub-form-row-id="subFormRowId"
                     :in-table-flag="inTableFlag"
                     :column-prop="columnProp"
  >
    <div class="full-width-input" :class="{'readonly-mode-cascader' : isReadMode}">
      <el-cascader ref="fieldEditor" :options="cascaderOptions" v-model="fieldModel"
                   :disabled="field.options.disabled || isReadMode"
                   :clearable="field.options.clearable"
                   :filterable="field.options.filterable"
                   :placeholder="field.options.placeholder || i18nt('render.hint.selectPlaceholder')"
                   :show-all-levels="showFullPath"
                   :props="{ checkStrictly: field.options.checkStrictly, multiple: field.options.multiple, expandTrigger: 'hover', value: valueKey, label: labelKey, children: childrenKey }"
                   @visible-change="hideDropDownOnClick" @expand-change="hideDropDownOnClick"
                   @focus="handleFocusCustomEvent" @blur="handleBlurCustomEvent"
                   @change="handleChangeEvent">
      </el-cascader>
      <template v-if="isReadMode">
        <span class="readonly-mode-field">{{ contentForReadMode }}</span>
      </template>
    </div>
  </form-item-wrapper>
</template>

<script>
import FormItemWrapper from './form-item-wrapper'
import emitter from '@/utils/emitter'
import i18n, {translate} from "@/utils/i18n";
import fieldMixin from "@/components/form-designer/form-widget/field-widget/fieldMixin";
import {
  pcTextArr,
  pcaTextArr,
} from "element-china-area-data";

export default {
  name: "cascader-widget",
  componentName: 'FieldWidget',  //必须固定为FieldWidget，用于接收父级组件的broadcast事件
  mixins: [emitter, fieldMixin, i18n],
  props: {
    field: Object,
    parentWidget: Object,
    parentList: Array,
    indexOfParentList: Number,
    designer: Object,

    designState: {
      type: Boolean,
      default: false
    },

    subFormRowIndex: { /* 子表单组件行索引，从0开始计数 */
      type: Number,
      default: -1
    },
    subFormColIndex: { /* 子表单组件列索引，从0开始计数 */
      type: Number,
      default: -1
    },
    subFormRowId: { /* 子表单组件行Id，唯一id且不可变 */
      type: String,
      default: ''
    },

  },
  components: {
    FormItemWrapper,
  },
  data() {
    return {
      oldFieldValue: null, //field组件change之前的值
      fieldModel: null,
      rules: [],
    }
  },
  computed: {
    labelKey() {
      return this.field.options.labelKey || 'label'
    },

    valueKey() {
      return this.field.options.valueKey || 'value'
    },

    childrenKey() {
      return this.field.options.childrenKey || 'children'
    },

    showFullPath() {
      return (this.field.options.showAllLevels === undefined) || !!this.field.options.showAllLevels
    },

    contentForReadMode() {
      let onlyLeafFlag = !this.field.options.checkStrictly
      let checkedNodes = this.$refs.fieldEditor.getCheckedNodes(onlyLeafFlag)
      if (!checkedNodes || (checkedNodes.length <= 0)) {
        return '--'
      } else {
        return checkedNodes.map(nodeItem => nodeItem.text).join(", ")
      }
    },

    cascaderOptions() {
      if (this.field.options.areaDataEnabled && (this.field.options.areaDataType === 1)) {
        return pcTextArr
      } else if (this.field.options.areaDataEnabled && (this.field.options.areaDataType === 2)) {
        return pcaTextArr
      }

      return this.field.options.optionItems
    }

  },
  beforeCreate() {
    /* 这里不能访问方法和属性！！ */
  },

  created() {
    /* 注意：子组件mounted在父组件created之后、父组件mounted之前触发，故子组件mounted需要用到的prop
       需要在父组件created中初始化！！ */
    this.registerToRefList()
    this.initOptionItems()
    this.initFieldModel()
    this.initEventHandler()
    this.buildFieldRules()

    this.handleOnCreated()
  },

  mounted() {
    this.handleOnMounted()
  },

  beforeUnmount() {
    this.unregisterFromRefList()
  },

  methods: {
    /* 开启任意级节点可选后，点击radio隐藏下拉框 */
    hideDropDownOnClick() {
      setTimeout(() => {
        document.querySelectorAll(".ep-cascader-panel .ep-radio").forEach((el) => {
          el.onclick = () => {
            console.log('test====', 1111)
            this.$refs.fieldEditor.popperVisible = false // 单选框部分点击隐藏下拉框
          }
        })
      }, 100)
    },

  }
}
</script>

<style lang="scss" scoped>
 /* form-item-wrapper已引入，还需要重复引入吗？ */

.full-width-input {
  width: 100% !important;

  :deep(.ep-cascader) {
    width: 100% !important;
  }
}

.readonly-mode-cascader :deep(.ep-cascader) {
  display: none;
}

</style>
